Blender 2.9 Smoke Sim noise bugged?
You need to check &quot;Is Resumable&quot; in the Cache section of the smoke domain physics properties. Then when you bake data and bake noise, the simulation should appear in your viewport.
For some background, I was having this same issue. After doing some digging, I found this answer here: https://developer.blender.org/T80372
&quot;This was a usability issue: Baking noise in the modular cache mode is only possible when also enabling the resumable option.&quot;
I wanted to make sure I knew what I was turning on by checking that option, so I will share this from the Blender manual as well:
&quot;Use Resumable Cache: Extra data will be saved so that you can resumed baking after pausing. Since more data will be written to drive it is recommended to avoid enabling this option when baking at high resolutions.&quot;